Check your storage

If you're moving to a lower-capacity device, you might need to optimize or remove some of your existing content. Find out what takes up the most space on your device in Settings > General > and tap [Device] Storage. Learn more about usage on iOS.

Manage your storage

There are a few ways that you can manage or reduce the storage on your device.

If you want to view the photos on your device after removing them from your camera roll, sync them from your iTunes Library. iTunes optimizes synced photos for your device, saving space. You can also sync a smaller selection of your photo library.

Apps

To reduce your usage with apps:

If the app stores data on the device, see if it can store its data in the cloud. Check the app's documentation or contact the app developer for more information.